Have taken a look in the .rtcom-eventlogger directory, and there is el.db, el.db-journal (empty), el-v1.db and el-v1.db-journal (empty)

I've copied these files to my laptop, and taken a look. Both the .db files are valid sqlite3 databases. Looking inside them, they both seem to have all the events one would expect in them (texts received, texts sent, missed calls etc)

Could it be something simple like the format of the database has changed, and for some reason the upgrade didn't add new columns/tables to the database?